What the door should be is open.
*What the door blew is open.
**What I kicked the door is open.
[?How/?What] the cocoa was is sweet.
[??How/*What] I made the cocoa is sweet.
Same facts in German, if my worthless opinion is worth anything. Can’t check in Brasilian, because even predicate adjectives can’t be pseudoclefted, in my even worthlesser opinion.